This crop factor 'thing' seems (I might be wrong..) to cause some confusion and mis-information. Here is an explanation that might clear some of it up. FOV, or Field of View is a more appropriate term.
Below is a photo. Suppose I have an 80-200mm lens, and I put that lens on a 35mm Nikon film camera. I take a shot at full extension (meaning at 200mm), and what you see below is the 35mm size. Now, I take the same lens, put it on my D100 and take a shot of the exact same position. The D100 will only capture the image highlighted below in the photo--it will not cover the same area of the 35mm camera, at the same 200mm focal length. The difference is the image circle and field of view. Now here is where the magnification factor comes in, and this is also where many photographers are benefiting from the change in FOV or 'crop'.
The D100's CCD creates an effect that looks like I actually used a longer lens. I haven't as I used the same lens, I just changed the Field of View, and the image circle. Because it's just a "crop" of the much larger 35mm's field of view (FOV), and then viewed at the same size as the 35mm's, It appears that a longer lens was used.
Below is a comparison of a standard 35mm's image circle (1), and within that (2) a D100's image circle. You can see the comparison in size between a standard 35mm frame, and the D100's.
This of course is almost exactly the same on the Canon digital slrs.
Jeff
photos from the Nikon Lounge.
Below is a photo. Suppose I have an 80-200mm lens, and I put that lens on a 35mm Nikon film camera. I take a shot at full extension (meaning at 200mm), and what you see below is the 35mm size. Now, I take the same lens, put it on my D100 and take a shot of the exact same position. The D100 will only capture the image highlighted below in the photo--it will not cover the same area of the 35mm camera, at the same 200mm focal length. The difference is the image circle and field of view. Now here is where the magnification factor comes in, and this is also where many photographers are benefiting from the change in FOV or 'crop'.
The D100's CCD creates an effect that looks like I actually used a longer lens. I haven't as I used the same lens, I just changed the Field of View, and the image circle. Because it's just a "crop" of the much larger 35mm's field of view (FOV), and then viewed at the same size as the 35mm's, It appears that a longer lens was used.
Below is a comparison of a standard 35mm's image circle (1), and within that (2) a D100's image circle. You can see the comparison in size between a standard 35mm frame, and the D100's.
This of course is almost exactly the same on the Canon digital slrs.
Jeff
photos from the Nikon Lounge.
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